# LumenGEO

> LumenGEO is an AI citation monitoring and GEO (Generative Engine Optimization) platform. We help brands get cited by ChatGPT, Perplexity, Gemini, and other AI search engines.

## Free Tools
- [Free GEO Audit](https://lumengeo.co/audit): Get your GEO Score in 60 seconds — see if ChatGPT cites your brand
- [GEO Action Plan Builder](https://lumengeo.co/tools/geo-action-plan): Answer 3 questions and get a personalized, prioritized GEO action plan — the exact tactics and steps to get cited, as a shareable plan or trackable checklist
- [GEO Tools Hub](https://lumengeo.co/tools): All of LumenGEO's free GEO tools in one place
- [AI Crawler Checker](https://lumengeo.co/tools/ai-crawler-check): Check if AI bots can access your website
- [GEO Readiness Scanner](https://lumengeo.co/tools/geo-readiness): Scan any URL for the 14 signals that drive AI citations
- [llms.txt Generator](https://lumengeo.co/tools/llms-txt-generator): Build a formatted llms.txt file so AI search engines can map your site
- [GEO Glossary](https://lumengeo.co/glossary): 70 GEO terms defined with quotable definitions

## Blog — GEO Research & Guides
- [What is GEO?](https://lumengeo.co/blog/what-is-geo): The complete guide to Generative Engine Optimization
- [GEO vs SEO](https://lumengeo.co/blog/geo-vs-seo): What changes when AI answers the query
- [How to Get Cited by ChatGPT](https://lumengeo.co/blog/how-to-get-cited-by-chatgpt): Data-driven guide to ChatGPT citations
- [Why Your Brand Isn't Cited by ChatGPT](https://lumengeo.co/blog/why-your-brand-isnt-cited-by-chatgpt): 10 common causes and concrete fixes
- [AI Search Engines Guide](https://lumengeo.co/blog/ai-search-engines-complete-guide): How each AI platform handles citations
- [What is a GEO Score?](https://lumengeo.co/blog/what-is-a-geo-score): How to measure AI search visibility
- [AI Search Optimization](https://lumengeo.co/blog/ai-search-optimization): Complete guide to getting cited (2026)
- [LLM Optimization](https://lumengeo.co/blog/llm-optimization): How to make AI models cite your brand
- [Perplexity SEO](https://lumengeo.co/blog/perplexity-seo): How to get cited in Perplexity AI
- [ChatGPT Citation Pipeline](https://lumengeo.co/blog/chatgpt-citation-pipeline): The 6-stage pipeline ChatGPT uses to select sources
- [AI Citation Signals](https://lumengeo.co/blog/ai-citation-signals): What content gets cited vs ignored (2026 data)
- [Google AI Overviews Optimization](https://lumengeo.co/blog/google-ai-overviews-optimization): Complete guide to AIO optimization
- [Bing SEO for AI Search](https://lumengeo.co/blog/bing-seo-for-ai-search): Why Bing indexing is load-bearing for ChatGPT and Copilot
- [GEO Tools 2026 Buyer's Guide](https://lumengeo.co/blog/geo-tools-2026-buyers-guide): 8 GEO platforms compared on pricing, features, and use case fit
- [How to Build Entity Authority for AI Search](https://lumengeo.co/blog/how-to-build-entity-authority-for-ai-search): The 6-mechanism framework for entity authority
- [GEO for E-commerce Brands](https://lumengeo.co/blog/geo-for-ecommerce-brands): Vertical-specific 3-layer strategy for e-commerce
- [GEO for B2B SaaS](https://lumengeo.co/blog/geo-for-b2b-saas): How to get your software into AI-generated shortlists
- [Claude SEO](https://lumengeo.co/blog/claude-seo): How to get cited by Anthropic's Claude via Brave Search
- [Microsoft Copilot SEO](https://lumengeo.co/blog/microsoft-copilot-seo): How to get cited by the most selective AI search engine
- [AI Search vs Google Search 2026](https://lumengeo.co/blog/ai-search-vs-google-search-2026): The traffic shift explained
- [Multi-modal GEO](https://lumengeo.co/blog/multi-modal-geo): Optimizing images and video for AI citation
- [How to Run a GEO Audit](https://lumengeo.co/blog/how-to-run-a-geo-audit): The complete 7-step methodology
- [Why AI Citations Decay](https://lumengeo.co/blog/why-ai-citations-decay): The 4.5-week half-life and the freshness program
- [Is Your Site Agent-Ready?](https://lumengeo.co/blog/is-your-site-agent-ready): GEO for the age of AI agents (ChatGPT Agent, Comet, MCP)
- [Does Schema Markup Help AI Citations?](https://lumengeo.co/blog/does-schema-markup-help-ai-citations): The 2026 causal evidence says no
- [Why Your Site May Be Invisible to AI](https://lumengeo.co/blog/why-your-site-may-be-invisible-to-ai): The Cloudflare edge-block layer most sites miss
- [You Can't Measure GEO With One Check](https://lumengeo.co/blog/you-cant-measure-geo-with-one-check): AI search is stochastic
- [We Ran 1,000+ GEO Audits](https://lumengeo.co/blog/geo-audit-findings-2026): What actually gets brands cited by AI

## Comparisons
- [ChatGPT vs Perplexity](https://lumengeo.co/compare/chatgpt-vs-perplexity)
- [ChatGPT vs Gemini](https://lumengeo.co/compare/chatgpt-vs-gemini)
- [Perplexity vs Gemini](https://lumengeo.co/compare/perplexity-vs-gemini)
- [ChatGPT vs Copilot](https://lumengeo.co/compare/chatgpt-vs-copilot)
- [ChatGPT vs Claude](https://lumengeo.co/compare/chatgpt-vs-claude)
- [GEO vs AEO](https://lumengeo.co/compare/geo-vs-aeo)
- [LumenGEO vs Otterly.AI](https://lumengeo.co/compare/lumengeo-vs-otterly)
- [LumenGEO vs HubSpot AI Search Grader](https://lumengeo.co/compare/lumengeo-vs-hubspot)
- [LumenGEO vs Semrush AI Visibility](https://lumengeo.co/compare/lumengeo-vs-semrush)

## Product
- [Pricing](https://lumengeo.co/pricing): Free audit, Playbook ($297), Starter ($49/mo), Pro ($99/mo)
- [GEO Optimization Playbook](https://lumengeo.co/playbook): 47-page playbook based on 37 real GEO experiments
- [Product Overview](https://lumengeo.co/product): AI citation monitoring SaaS

## Key Definitions
- **GEO (Generative Engine Optimization)**: The practice of structuring content so AI search engines cite your brand in their answers
- **GEO Score**: A 0-100 metric measuring brand visibility across AI search platforms (Citation Presence, Prominence, Quality, Density)
- **AI Citation**: When an AI search engine explicitly names and links to your website as a source in its response
- **Fan-Out Queries**: Machine-generated sub-queries that ChatGPT creates from user prompts (89.6% of prompts trigger 2+ sub-queries)
- **The LumenGEO Citation Pipeline Model**: A 6-stage framework describing how ChatGPT selects sources to cite
- **Citation Halo**: The indirect citation benefit a brand receives when authoritative third-party sources that cite the brand are themselves cited by AI search engines
- **Entity Authority**: The strength and consistency of machine-readable signals about a brand across the web — including structured data, entity database presence, and brand mention patterns

## Key Research Findings
- 6.5% of unique domains in source documents receive inline citations in AI answers (Georgia Tech, 2024)
- Brand mention frequency correlates with AI citation at r=0.664 — 3x stronger than backlinks (r=0.218) (SE Ranking)
- Pages with 15+ named entities earn citations at 4.8x the rate of pages with fewer than 8 entities (Wellows)
- Original-data content earns 4.1x more citations than content that summarizes other people's data (Digital Bloom)
- 46.7% of Perplexity's top-10 cited sources are Reddit pages (Indig/Gauge)
- 99.5% of Google AI Overview citations come from pages already ranking on Google page 1 (BrightEdge)
- 32.9% of all citations come from fan-out sub-queries with zero traditional search volume (Ekamoira)
- Definitive phrasing earns citations at 36.2% vs 20.2% for hedged language — 1.8x advantage (Growth Marshal)